Eenst juhl



E. JUHL.

Lqck.

No. 223,739. Patented Jan. 20, 1sso.

Wn? ewes NPETERS. PHOTO-HTHOGRAPHE. WASMINGTO 4 UNITED STATES PATENTOFFICE.

ERNsrr JUHL, vor HAMBURG, GERMANY.

SPECIFICATION forming part of Letters Patent No. 223,739, dated January20,` 1880. Application filed April 16, 1879.

To all whom it may concern:

Be it known that I, ERNST JUHL, of Hamburg, German Empire, have inventedcertain Improvements on Safety-Locks, of which Vthe following is aspecification.

The present invention consists in a doorlock which embraces in itsconstruction a sliding bolt carrying tuinblers moving at right anglesthereto and having three resting-surfaces. By the insertion of a keyinto the lockcasing these tumblers are partially set, while they areentirely set by their'action upon the key when the bolt is projected bya handle or means other than the key.

In the accompanying drawings, forming part of this specification, Figure1 represents the lock with the locking-bolt in its middle position andthe latch-bolt projected. Fig. 2 represents the same lock with the twobolts Withdrawn into the lock-casing. Fig. 3 is a sec tion taken throught-he lineA B, Fig. l. Figs. 4 and 5 show different forms of tum blers.Fig. 6 illustrates a flat key.

The bolt A is apertured for the reception of the tumblers B3 B4, which,in the present instance, must be lifted to a slight degree before theJbolt, together with its tumblers, can be moved back or forth. Thislifting of the tumblers is effected by inserting the key D.

Each tumbler possesses three resting-poin ts,

so that the bolt can assumethree positions, Fig. 7 exhibiting the samein its middle position.

The movement of the bolt is eiiected by the toothed segment F2 engagingwith a rack, F', on the bolt. When the locking-bolt is being clrawwbackinto the casing the nose a2 on said bolt will come in contact with theprojection b2 of the latch-bolt G and retract the latter. The latch-boltcan alsobe drawn back bythe arm d ofthe hub H, and a spring, g, suitablylocated, and bearing against said bolt, tends to hold the same in aprojected state.

The letter h represents a guide-pin folI the latch-bolt, and i, k, and Zare guides for thetumblers must be arranged in a correspondingsymmetrical manner.`

In the lock shown in the present instance only the middle tumbler, B4,(shown in Fig. 5,) is raised by the insertible key, so that the stump onthe lock-casing can slip out of the deep cut l 2 of the tumbler. l

It may be observed that the movement of the bolt is only prevented bythis cut just mentioned.

After the tumbler B4 has been lifted the depth of the cut 1 2 the boltcan be moved, all the tumblers being lifted when this movementcommences, so that the stump will be permitted to pass through the sloty, connecting the larger openings in the tumbler.

The lifting of the tumblers is effected by the inclined surfaces z onthe lower edges of the tuinblers, which glide-through the nibs on thekey-bit.

The split bow-spring M, applied to the bolt, serves to hold t-hetumblers in their normal position. i Y

The bolt A can be moved from the inside or outside of the door by theinsertion of the key into the lock-casing. The operation of thelatch-bolt is effected in a like manner; but

the same can also be opened and closed from the inside of the doorWithout using the key.

If the door is locked by the bolt A', the latch cannot be moved, thenose a preventing any movement.-

The arrangement of the openings in the tumblers for the stump onthelock-casing, likewise thearrangeinent ofthe tumblers,.may be variedwithoutdeparting from the spirit of the invention.

I claim as new and desire to secure by Letters Patent- The combinationof the bolt carrying tumblers moving at right angles thereto, and havingthree resting-surfaces, with a key acting, when insertedl into thelock-casing, to partially set the tumblers, while they are entirely setby their action upon the key when the bolt is projected by a handle ormeans other than the key, as and for the purpose set forth. 1

In.testimon y whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ERNST JUEL.

Witnesses i GERARD voN NAWRooKI, BERTHOLD Rol.

IOO

